Slip torque

Concerning the sizes shown in the table, please note that the shaft's slip torque is smaller than the rated torque of MBB-C.

Unit : N・m

Part Number

Bore Diameter（mm）

3

5

6

MBB-19C

0.8

MBB-32C

2

4.2

MBB-40C

9.8

These are test values based on the condition of shaft's dimensional allowance: h7, hardness: from 34-40 HRC, and screw tightening torque of the values described in MBB-C dimensional table.

Structure

Clamping Type

MBB-C Aluminum alloy hub

Material/Finish

MBB

Hub

A2017
Alumite Treatment

Bellows

SUS304

Hex Socket
Head Cap Screw

SCM435
Ferrosoferric Oxide
Film (Black)

Characteristics

Applicable motors

MBB

Servomotor

◎

Stepping Motor

◎

General-purpose Motor

-

◎: Excellent ○: Very good

Property

MBB

Zero Backlash

◎

Allowable Misalignment

○

◎: Excellent ○: Very good

This is a bellows type flexible coupling.

The bellows allows eccentricity, angular misalignment, and end-play.

The bellows is stainless steel.

Application

Actuator / High precision XY stage / Semiconductor devices / Encoder

Selection

Selection Example

In case of selected parameters of shaft diameter of φ10 and load torque of 2 N・m, the selected size for MBB is MBB-27C.

Eccentric Reaction Force

Thrust reaction force

Change in static torsional stiffness due to temperature

This is a value under the condition where the static torsional stiffness at 20°C is 100%.
The change of MBB in torsional stiffness due to temperature is small and the change in responsiveness is extremely small. If the unit is used under higher temperature, be careful about misalignment due to elongation or deflection of the shaft associated with thermal expansion.